Swappen - @State und mutating

App.swift

@@ -9,9 +9,12 @@ struct TheSwiftWeek: App {
     var body: some Scene {
         WindowGroup {
             VStack{
-                Text(.myVehicle)
-                TrainView(train: train)
-                TrainView(train: train2)
+               
+                
+                    Text(.myVehicle)
+                    TrainView(train: train)
+                    TrainView(train: train2)
+                            Spacer()
             }
             
         }

ContentView.swift

@@ -0,0 +1,31 @@
+
+
+import SwiftUI
+
+enum TabLabel: String {
+    case bikes
+    case trains
+    case cars
+    var title: String { rawValue.capitalized }
+}
+
+
+struct ContentView: View {
+    var body: some View {
+        TabView {
+            Tab(TabLabel.bikes.title, systemImage: "bicycle")   {
+                BikeView()
+            }
+            Tab(TabLabel.bikes.title, systemImage: "train.side.front.car")   {
+                TrainView()
+            }
+            Tab("drücken", systemImage: "car") {
+                SwapperView()
+            }
+        }
+    }
+}
+    
+#Preview {
+    ContentView()
+}

Localizable.xcstrings

@@ -1,6 +1,14 @@
 {
   "sourceLanguage" : "en",
   "strings" : {
+    "drücken" : {
+      "comment" : "A tab label for a tab that prints something.",
+      "isCommentAutoGenerated" : true
+    },
+    "Hello, World!" : {
+      "comment" : "A simple text view with padding applied to it.",
+      "isCommentAutoGenerated" : true
+    },
     "My Vehicle" : {
       "extractionState" : "manual",
       "localizations" : {
@@ -18,6 +26,22 @@
         }
       }
     },
+    "Show Alert" : {
+      "comment" : "A button that triggers an alert when pressed.",
+      "isCommentAutoGenerated" : true
+    },
+    "Swapping %@ <-> %@" : {
+      "comment" : "A label displaying the current state of the swap operation, showing the values of the two variables before and after the swap.",
+      "isCommentAutoGenerated" : true,
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "new",
+            "value" : "Swapping %1$@ <-> %2$@"
+          }
+        }
+      }
+    },
     "Train %@ has ^[%lld minute](inflect: true) delay." : {
       "comment" : "A localized string resource describing a train. The first argument is the name of the train. The second argument is the delay in minutes.",
       "isCommentAutoGenerated" : true,
@@ -48,6 +72,18 @@
           }
         }
       }
+    },
+    "Vorher %@ <-> %@" : {
+      "comment" : "Displays two text fields with the text \"Vorher\" and \"Nachher\" followed by a button that, when pressed, swaps the text in the two fields.",
+      "isCommentAutoGenerated" : true,
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "new",
+            "value" : "Vorher %1$@ <-> %2$@"
+          }
+        }
+      }
     }
   },
   "version" : "1.1"

PaddingView.swift

@@ -0,0 +1,11 @@
+import SwiftUI
+
+struct PaddingView: View {
+    var body: some View {
+        Text("Hello, World!")
+            .padding()
+    }
+}
+#Preview {
+    PaddingView()
+}

SwapperView.swift

@@ -0,0 +1,44 @@
+import SwiftUI
+
+struct SwapperView: View{
+
+    @State var sw = Swapper(a: "Apfel", b: "Banana")
+    @State var a = "Apfel"
+    @State var b = "Banane"
+    
+    
+    func tausche(){
+        let tmp = a
+        a = b
+        b = tmp
+    }
+     
+    var body: some View {
+        VStack {
+            Text("Vorher \(a) <-> \(b)")
+
+            Button("Show Alert") {
+                print("Hello, World!")
+                tausche()
+                sw.tausche()
+            }
+            Text("Swapping \(sw.a) <-> \(sw.b)")
+            
+        }
+    }
+}
+
+struct Swapper<T> {
+    var a: T
+    var b: T
+    
+    
+   mutating func tausche(){
+        let tmp = a
+        a = b
+        b = tmp
+    }
+}
+#Preview {
+    SwapperView()
+}

TheSwiftWeek.xcodeproj/project.pbxproj

@@ -11,6 +11,9 @@
 		0CC14A892E92EEA900271E8D /* Playground.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0CC14A882E92EEA900271E8D /* Playground.swift */; };
 		FBA00D6D2EA78411006F8B9A /* Localizable.xcstrings in Resources */ = {isa = PBXBuildFile; fileRef = FBA00D6C2EA78411006F8B9A /* Localizable.xcstrings */; };
 		FBA00D6F2EA78853006F8B9A /* Color.swift in Sources */ = {isa = PBXBuildFile; fileRef = FBA00D6E2EA78850006F8B9A /* Color.swift */; };
+		FBA00D712EA7A839006F8B9A /* PaddingView.swift in Sources */ = {isa = PBXBuildFile; fileRef = FBA00D702EA7A830006F8B9A /* PaddingView.swift */; };
+		FBA00D732EA7A96C006F8B9A /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = FBA00D722EA7A96C006F8B9A /* ContentView.swift */; };
+		FBA00D752EA7ACE1006F8B9A /* SwapperView.swift in Sources */ = {isa = PBXBuildFile; fileRef = FBA00D742EA7ACDD006F8B9A /* SwapperView.swift */; };
 		FBA6FA5E2EA63EA300C373EC /* Models.swift in Sources */ = {isa = PBXBuildFile; fileRef = FBA6FA5D2EA63EA300C373EC /* Models.swift */; };
 		FBA6FA602EA66C2E00C373EC /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = FBA6FA5F2EA66C2E00C373EC /* Assets.xcassets */; };
 		FBA6FA622EA76AAD00C373EC /* BikeView.swift in Sources */ = {isa = PBXBuildFile; fileRef = FBA6FA612EA76AAD00C373EC /* BikeView.swift */; };
@@ -24,6 +27,9 @@
 		0CC14A882E92EEA900271E8D /* Playground.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Playground.swift; sourceTree = "<group>"; };
 		FBA00D6C2EA78411006F8B9A /* Localizable.xcstrings */ = {isa = PBXFileReference; lastKnownFileType = text.json.xcstrings; path = Localizable.xcstrings; sourceTree = "<group>"; };
 		FBA00D6E2EA78850006F8B9A /* Color.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Color.swift; sourceTree = "<group>"; };
+		FBA00D702EA7A830006F8B9A /* PaddingView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = PaddingView.swift; sourceTree = "<group>"; };
+		FBA00D722EA7A96C006F8B9A /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
+		FBA00D742EA7ACDD006F8B9A /* SwapperView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SwapperView.swift; sourceTree = "<group>"; };
 		FBA6FA5D2EA63EA300C373EC /* Models.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Models.swift; sourceTree = "<group>"; };
 		FBA6FA5F2EA66C2E00C373EC /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		FBA6FA612EA76AAD00C373EC /* BikeView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BikeView.swift; sourceTree = "<group>"; };
@@ -45,9 +51,12 @@
 		0CC14A6D2E92EC4700271E8D = {
 			isa = PBXGroup;
 			children = (
+				FBA00D742EA7ACDD006F8B9A /* SwapperView.swift */,
+				FBA00D702EA7A830006F8B9A /* PaddingView.swift */,
 				FBA00D6E2EA78850006F8B9A /* Color.swift */,
 				FBA6FA632EA7715000C373EC /* Extentions.swift */,
 				0CC14A842E92EC7A00271E8D /* App.swift */,
+				FBA00D722EA7A96C006F8B9A /* ContentView.swift */,
 				FBA6FA5F2EA66C2E00C373EC /* Assets.xcassets */,
 				0CC14A882E92EEA900271E8D /* Playground.swift */,
 				FBA6FA612EA76AAD00C373EC /* BikeView.swift */,
@@ -143,10 +152,13 @@
 			files = (
 				FBA6FA5E2EA63EA300C373EC /* Models.swift in Sources */,
 				FBA6FA662EA7725A00C373EC /* TrainView.swift in Sources */,
+				FBA00D752EA7ACE1006F8B9A /* SwapperView.swift in Sources */,
 				0CC14A892E92EEA900271E8D /* Playground.swift in Sources */,
 				FBA6FA642EA7715E00C373EC /* Extentions.swift in Sources */,
 				0CC14A872E92EC7B00271E8D /* App.swift in Sources */,
+				FBA00D732EA7A96C006F8B9A /* ContentView.swift in Sources */,
 				FBA00D6F2EA78853006F8B9A /* Color.swift in Sources */,
+				FBA00D712EA7A839006F8B9A /* PaddingView.swift in Sources */,
 				FBA6FA622EA76AAD00C373EC /* BikeView.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;